Telephony.



M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED no.4, 1912 1 ,1 1 6,542. Patented Nov. 10, 1914.

2 SHEETS-SHEET 1.

WITNESSES INVENTOR 1 BQFQBW TONLLJomqsou ATTORNEY M. L. JOHNSON.

TELEPHONY. 1,116,542.

APPLICATION FILED DEG.4, 1912.

Patented Nov. 10, 1914.

2 $HEETS-SHEET 2.

QNITNRESSES N Y O e 4 L V ENTD R M ORTON LrJ-ozmson ATTQ RNEY UNITEDSTATE? PATENT OFFICE.

MORTON L. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOB, BY MESNE OF CHICAGO,ILLINOIS, A CORPORATION OF ILLINOIS.

FRANK B. COOK COMPANY,

TELEPHONY.

Application filed December 4, 1912.

Specification of Letters Patent.

Serial No. 734,863.

To all whomit may concern:

Be it known that I, MORTON L. Jonxson, citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Telephony, of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification.

My invention relates to signaling systems and has for its object theprovision of such a system in which a plurality of signal sending linesmay be separably associated with the signal receiving instrument whichis interchangeably associated with the sending lines by means ofsuitable selector mechanism, there being preferably provided a pluralitycf signal receivers less in number than the sendinglines, the selectormechanism serving to associate sending lines with idle signal receiversto the exclusion sending lines.

My invention, ment, constitutes signaling system application Serial No.1912.

My invention connection with telephone exchange systems and by means ofthe invention I am enabled to receive and, if desired. to record thenumbers of calling lines by signal receivers that are less in numberthan the lines and which are r-electively associated with the lines inthe general manner which has been described. These signal receivers may,if desired, be individual tothe operators positions and the circuit forefl'ecting their operation may, if desired, be accompanied by conductorsconstituting selected extensions of calling lines with which theoperators telephones may be connected in order that the operators mayascertain the numbers of the called lines. the signal receivers thenserving to indicate to the operators the numbers of the calling lines.\Vhen the open ators have been informed automatically of the numbers ofthe calling lines by means of said signal receivers and have beeninformed by the calling subscribers of the numbers of the desired lines,the operators may proceed to connect the calling and called lines byusual or preferred equipment.

in its preferred embodian improvement upon the disclosed in myco-pending TOQAZ'. filed June 15.

l which i 1f signalrecei'vers previously associated with other is ofparticular service in I will explain my invention more fully byreference to the accompanying drawings in Figures 1 and 2 takencollectively with the conductors at the tops of the sheets inalinenicnt. illustrate a telephone exchange system having a signalingsystem of my invention.

1 have shown but two telephone lines extending to stations N0. 1357 andN0. 1358, though it will be understood that there are many telephonelines of the kind illustrated, the two lines illustrated being assumedto belong to the same group of one hundred lines, it being preferable todivide the lines leading to the same exchange into groups of onehundred. At each of the telephone stations illustrated I have shown atelephone switch hook 1 having a normal contact which the telephonereceiver 2 when, upon the switch hook. whereby a signal bell bridgeincluding a signal hell 3 and a condenser 4 is connected between thesides of the line. The telephone switch hook I has an alternatecontact'which is engaged thereby when the receiver 2 is removed wherebya telephone bridge is established between the sides of the line andwhich bridge includes telephone receiver 2 and telephone transmitter 5.The line sides terminate at the exchange in the armature switches of acutoff relay 6, the line sides also terminating directly in multiplejacks'7. The operator may connect calling and called lines by means ofany preferred equipment such as the cord circuit link connectorequipment illustrated at 8. I will not describe the ink connector 9 asthe illustration furnrbed will be sufficient to enable the same read tohe understood by those skilled in the art.

, It inay be assumed that station 1357 is a calling station and thatstation 1358 is a called station. When the calling party at station 1357removes his telephone receiver 2 from its switch hook circuit isestablished at the calling subscribers switch hook by way of thearmature switches of the cutoti relay 6 and the armature switches of asecond cutoff relay 9' through the common battery 10 and the line relay11. lVhen the armature switch of the line relay 11 engages its alternatecontact a circuit is established from its armature switch, which isgrounded, through its alternate contact, the armature 1 switch of relay1'2 and its normal contact,

ASSIGNMENTS, TO

Patent-ed Nov. 10, 1914.

is engaged therewith through the agency of the rotary magnet 13, thesluggishly operating relay 14, the left hand armature switch of thisrelay and the contact engaged there by, the side switch wiper 15 in itsfirst position, to the grounded battery 10. The rotary magnet 13thereupon sets the wipers 16, 17, 18, 19, 20 and 21"into operation,these wipers being mounted upon a shaft common thereto, and theycontinue their rotary step by step movement until the wiper 18 engagesan ungrounded waiti gcontact. That 1s, these wipers 16 to 21 inclusiveare set into operation toseek the calling line and are arrested inassociation with such calling line owing to the removal of ground fromassociation with the calling line at the armature switch of the linerelay 11 of the calling llne. The waiting contacts wiper 18 are normallygrounded by way of the normal contacts of the armature switches of therelays 11 of the group of telephone lines which have contacts individualthereto in the set of waiting contacts for the wiper 18, each of theother wipers 16 to 21 inclusive also having waiting contacts individualto the lines in the group to which the line selecting switch beingdescribed is appropriated. Under the assumpion that there are onehundred lines in a group the wipers 16. to 21 inclusive have one hundredwaiting contacts.

In order that more than one calling line in a group may be hunted at thesame time the selector switch having wipers 16 to 21 inclusive isassociated with additional similar line hunting switches, the similarlypositioned waiting contacts of the wipers of these line hunting switchesbeing multiply related. -When the wiper 18 has engaged the waitingcontact from which ground has been disconnected at the armature switchof the corresponding calling line, circuit for the private magnet 22,which was estab* lished upon the initial operation of the rotary magnet13, is opened at the armature switch of the calling line whereby theside switch wipers 15, 23 and 24 are moved into their second and finalpositions in which the circuit of the rotary magnet 13 is opened at thewiper 15 whereby the wipers 10 to 21 inclusive remain in the position towhich they have been brought. WVhen the side switch wiper 24 is broughtinto its second position circuit is established from its groundedwaiting contact through this side switch wiper, the wiper 19 and thewaiting contact then engaged thereby, the cutoff. relay 9 to thegrounded battery 10. When the. cutoff relay 9 is energized ,its lowerarmature switch opens the circuit for the line relay 11 whereby groundis restored to the waiting contact engaged by the wiper 18 so thatsimilar multiply related contacts in other line seeking switches will begrounded to prevent any such other linel seeking switch from selectingthe calling line previously selected by the switch whose wiper 18 hasbeen actuated and thereafter brought to rest as described. Owing to thedeenergization of the private magnet 22 the relay 25 is connected inbridge of the conductors leading to the wipers 16 and 17 and as thesewipers are included in the talking sides of the calling line the relay25 is energized owing to the connection established between the linesides by the switch hook at the calling station. The lower groundedarmature switch of. the relay 25 now establishes a circuit through therotary magnet 26, the'sluggishly operatin relay 27, the side switchwiper 28 in its first position, to the grounded battery 10. The rotarymagnet 26 causes the wipers 29, 30, 31 and 32 to turn step by step untilthe wiper 31 engages an ungrounded waiting contact whereupon thesewipers will be brought to rest owing to the denergization of the privatemagnet 33 whose circuit was established upon the initial operation ofthe rotary magnet 26, the private magnet 33, when. denergized, effectingthe movement of the side switch wipers 34, 35 and 28 to their second andfinal positions in which the wiper 28 opens the circuit for the rotarymagnet 26 allowing the wipers 29 to inclusiveto remain at rest with thewiper 31 engaging the nn-- grounded waiting contact. Similarly pos1-tioned waiting contacts of the wipers 29 and 30 are individual to anoperator, there being as many operators as there are waiting contacts ineach bank of the wipers 29 and 30. The waiting contacts of each operatorselector switch is multiply related with similarly positioned waitingcontacts or operator selector switches.

One link connector 8 has an operators telephone 'A terl'ninating in'theuppermost waiting contacts of the banks of watlting contacts of thewipers 29 and 30. The other link connector 8 has an operators telephoneset Ii terminating in the next to the uppermost waiting contacts of theaforesaid banks of waiting contacts. The waiting contacts of the wiper32 are similarly associated with signal receiving and recording devicesC, D, which are individual to the operators positions. \Vhen the sideswitch wiper 34 is in its second position it engages a grounded waitingcontact whereby ground is placed upon the wiper 31 so that the waitingcon tacts of other switches that are in multiple with the waitingcontacts engaged by the actuated wiper 31 are guar ed to prevent wipersof other switches similar to the actuated wiper 31 from resting uponsuch multiply related waiting contacts. When the side switch wiper35 isin its second po sition it esablishes a circuit traceable from thegrounded battery 10. the relay 36, the left hand armature switch of thisrelay and gimme its normal follow up contact, the armature switch ofrelease magnet 37 and its engaged contact, the side switch wiper 35 init's second position and its engaged contact, the

wiper21 and its engaged Waiting contact,-

the segmental contact 8, the adjacent one of the four contact arms39'that areadapted individuall to connect this segmental contact 38 witthe-uppermost of the adjacent row of waiting contacts (the segmentalcontact 38 and the uppermost one of'the adjacent row of waiting contactsbeing normally-connected by an arm 39), the uppermost armature switch ofthe relay 40 and its follow-npcontact, the winding of the relay 40, toground. 1

Themechanism having the elements 38 and 39in the circuit just traced isindividual to thecalling line, each telephone line havin a similarmechanism individual thereto. %Vhen the relay 36 was energized itestablished a locking circuit for itself traceable from the groundedbattery 10 through the winding of the relay 36, the left hand armatureswitch of this relay and its now alterna'oe contact, to the two waitingcontacts joined by the side switch wiper 34 in its second position andone of which contacts is grounded. When circuit is established throughthe relay 40 this relay establishes a locking circuit for itselftraceable from the grounded terminal of this relay, its winding, itsuppermost armature switch, the alternate contact of this armatureswitch, the normally closed switch 41, to the grounded battery 11). Theinitial circuit employed for energizing the relay 36 also established acircuit for the sluggishly operating relay 42 i which operates when therelay 40 operates. The,left hand armature switch of relay 42 closes thecircuit of the restoring'magnet 43. The armature of the restoring magnet43 is are shaped, the center of this are being co-incident with the axisof the pivot 44 of an arm 45 that carries said armature. The arm 45 hasa relation to the toothed detents 46, 47 similar to the relation of theside switch arm governed by the private magnet in the mechanismillustrated upon page 530' of Van Deventers Telephonology. The detents46 and 47 are operated by a magnet 48 having mechanical control of thedetents 46 and 47 similar to the control had by the private magnet uponsimilar detents in the switch disclosed in Telephonolagy. The right handarmature switch of relay 42 temporarily opens the circuit of the magnet48 to prevent its premature operation. The circuit of relay 40 havingbeen closed and the relay 42 having been released in its time, circuitfor the magnet 48 is closed at the right hand armature switch of relay42. The circuit for this magnet 48 includes a circuit interruptingdevice later to be described in connection with Fig. 2 whereby the-magnet 48'is, intermittently energized to cause the step by step rotarymovement of the armature of magnet 43 in its lane a'swill bewellunderstood by those amiliar' with this type of ap aratus.

As illustrate the circuitof magnet 48 is interrupted five times and inthe last step the contacts of switch 41 are separated to open thelocking circuit of the magnet 40 whereby the circuit of the relay 48 isopened at the lower armature switch of relay 40, whereby the operationof the magnet 48 ceases. \Vhen the magnet 48 was previouslyintermittently operated its grounded armature intermittently engaged itscontact intermittently to close circuit through the motor magnet 49 tooperate the ratchet wheel 50, the ratchet wheel being fixed upon a shaftupon which in turn the arms 39 pertaining to all of the lines of a groupare fixed, whereby the arms 39 which were engaged-with the uppermostcontacts of their associated banks of waiting contacts are stepped offof these contacts into engagement with succeeding contacts, such arms 39continuin their movements until they step off of their associated banksof waiting contacts. the arms 39 having been 3 moved in counterclockwise'directions. Thus s the element 50 and the elements 40 to 49inclusive associated therewith are common to the lines of the group ofone hundred telephone lines, while each element 38, the arms 39 andother parts associated therewith are individual. to each of thetelephone lines of such group, the invention having for its object theprovision of a motive apparatus common to the telephone lines for ocrating devices individual to the telephone ines for the general purposeof the system.

The devices havin the elements 38, 39 and pertaining to a part cularcalli-n line is the only device which will operate or effecting circuitchanges, the arms 39 of other devices mechanically coupled with the arms39 associated with the calling line being. temporarily ineffective whenother lines of the group are calling owing to the opening of thecircuits of relays 36 of other line seeking switches of that group atthe associate segments 38 from which the associate arms 39 have beenstepped. v

In a manner to be described the second waiting contact engaged by an arm39 is employed for furnishing the selected operator with the first digitof the number of the calling line, the next waiting contact with thesecond digit of suchnumber, the third waiting contact with the thirddigit of such number. and the fourth waiting contact with the fourthdigit of such number. The arm45 of the magnet 43 remains in its ofi"normal position in which it separates the contactsiof the switch 41until tlie'next calling lin'eseeks the employment efthe motorm'a'gn'eti49, on

which account the relay 42 is provided with Ill? an intermediatearmature switch which serves temporarily to close the locking circuitfor the relay 40 (this locking circurhnow being open at 41) until themagnet 43 has had its. restoring movement started, a single closure forthe circuit of the restoring magnet 43 at the left hand armature switchof relay 42 being sufficient to cause the arm 45 to be restored tonormal, all as will be well understood by those skilled in the art.

Having now described the use of switches common to a plurality of linesthat are adapted to seek and attend: calling linesand having 'enerallydescribed the switches employed or selecting idle operators and idlesignal receivers C D belonging to such operators, I will now describethe manner in which the acti e instrument having the elements 3S and 39coiiperates with the elements 20, 36 and and apparatus to be describedfor operating the signal receivers for the purpose of informing theselected operator of the number or designation of the calling line 1-,

In Fig. 2 I have shown two well known ticker recorders which may beemployed in practising the invention, each recorder being illustrated asbelonging to an operators position within range of the operators atthesepositions. Each recording signal instrument illustrated includesapolarized magnet 51 whose armature oscillates the well known ratchetwheel actuating device 52,the ratchet wheel 53 which is, actuated beingfixed upon a shaft 54 that carries a printing wheel 55 provided withprinting characters, the said shaft also carrying a weighted pulley 56for turning the shaft when it is permitted to turn by the operation ofthemagnet 51. The equipment also includes a printing magnet 57 whosearmature presses a paper tape 58 against the printing wheel 55 whenprinting is to be effected. The periphery of the printing wheel 55 isinked by an inking roller 59. The paper tape is fed in any suitable wayfamiliar to those skilled in the art.

Direct currents of opposite polarity are applied alternately to thewinding of the polarized magnets 51 whereby the shafts 54 arecontinuously kept in rotary stepping movement, the shafts 54 beingturned step by step in order that the printing characters upon the facesof the printing wheels may be properly presented to the tape. I haveshown a source of grounded direct currentfor impressing current ofpositive polarity upon the magnets 51 and a source of grounded directcurrent 61 for impressing current of negative polarity upon the magnets51. The positive and ncat ve terminals. respectively, of the source; ofcurrent 60 and 61 are connected by crushes with disks 62, 63 that arefixedly mounted upon an insulated shaft 64 driven by a .otor 65. .Thesedisksare provided of the shaft 64. Circuit with metallic continuations66 which are flush with sections of insulating material 67. Brushes 68,69 are successively engaged by the projections 66, the engagementbetween one brush and each finger 66 of one disk be ing followed 30later by engagement between the other brush and a finger 66 of the otherdisk. The brushes 68 and 69 constitute multipled terminals of eachpolarized magnet 51, the other terminal of each of these magnets beinggrounded. Two of the fin-- gers or projections 66 upon each disk 62, 63are spaced 120 apart and the remaining fingers or projections are spaced60 apart, there thus being five such fingers to each disk. Each diskthus causes the energization of each magnet 51 five times in each diskrevolution, each of the five energizations occasioned by one disk beingfollowed 30 later by the energization of the magnets 51 effected by theother disk. As these disks direct positive and negative currentrespectively to the polarized magnets 51 the armature-s of these magnetshave five complete oscillations for each revolution of the shaft 64. Theshaft 54 thus has eight periods of 'rest that prevail throughoutsubstantially 30 of rotation of the shaft 64 and two periods of restthat prevail substantially throughout 60 of rotation of the shaft 64,the shaft- 54 thus having ten periods of rest during each revolution ofthe shaft 64. The equipment having the elements 51 to 69, inclusive, iswell known by those skilled in the art. The shaft 64 carries a disk 70that has electrical connection with a brush 71 but once durin eachrevolution aving been previously partially established at the lowerarmature switch of relay 40 for the magnet 48 controlling motor magnet49, circuit for this magnet 48 is completed once on each revolution ofthe shaft 64 so that the wheel '50 is stepped around. The shaft of wheelbrushes 68 and 69 are between the most widely separated fingers 66 ofthe disks 62 and 63, whereby ample opportunity is afforded f0! 5 eppingthe wipers 39 from contact buttons to contact buttons. The

shaft 64 also carries ten disks 72, 73, 74, '75,

76, 77, 78, 79, 80 and 81 that are respectively engaged by brushes 72 7374, 75. 76 77 78 79 80 and 81 once upon each revolution of the shaft 64.The first disk 72 anegiaa 7-2 45 after the disk'70 nections for 71 andso on throughout 1 brushes 39.

the waiting contacts of the The wiper 39 individual to each line isincluded in circuit connection g with the selected printing magnet 57 bynected with one terminal of the grounded battery 10 during the time thatthe printing wheels 55 are at rest.

means of the wipers 20 and 32, one terminal or each printing .inagnetbeing grounded while the other. terminal of each printing The magnet 57depends for its connection 5 switches, each selector switch having await:

with the battery 10 upon the waiting contacts swept over by the-activearm 39, segmental contact 38 the wiper 20 and its engaged waitingcontact, the right hand arina i ture switch of relay 36, the switch -36,the wiper 32 and its engaged contact, this latter contact beingconnected with the magnet 57 of the selected receiver.

The peripheries of the printing wheels,

tor the purpose of my present invention, are

provided with printing characters in the form of digits. The brush 72 isconnected with the battery 10 when the printing wheels 55 are presentingdigits 1 to thetapes 58; the brush 73 is connected with the battery 10when the printing wheels 55 are presenting digits 2 to the tapes 58; thebrush 74 is connected with the battery 10 when the printing wheels arepresenting digits 3 to the tapes 58, and so on, brushes 75 76 77, 78,79, S0 and-81 being, respectively connected with the battery 10 when theprinting wheels are presenting the digits 4, 5, 6. 7, 8, 9, and 0 to thetapes 58,

magnet is inultipled in the diiferent selector ing contact for its wiper32 that belongs but one printing magnet.

By the equipment which has been described the number of the calling lineis printed upon the tape 58 of the selected printing magnet 57, thisoperation being preferably performed within view of the operator whosetelephone set has been antomatically selected by the calling subscriberand which selected operator depresses her listening key 82 to bring-hertelephone set into circuit with the talking wipers 16, 17, 2-9 and 30and thereby into circuit with the calling line to ascertain from thecalling subscriber the number of the desired line whereafter theoperator may, by any suitable or preferredmeans connect the calling andcailed lines.

I have shown well known cord connect- '1 ing equipment 8 and wellknownmultiple jack structures 7 whereby 'callihgaiid called lines may beconnected" and as this equips ment is well understood by those skilledin Each telephone line is provided with as 1 many waiting contacts forits wiper 39 as there are digits in the number assigned to suchtelephone line. These waiting contacts are connected with those of thebrushes 72to 81, inclusive, that are connected with the battery 10 whenthe digits of the printing wheels 55 corresponding to calling lines arepresented to the tape 58 belonging to ,the selected printing magnet 57,the magnets 57 constituting the portions of the signal receivingequipments that are selectively associated with the lines so that thetapesbelonging thereto may receive record of the different calling linesthat have selected the printing magnets pertaining thereto. Thus in thecase of telephone station 1357 the next 'to the top button is connectedwith brush 7 2 the next button is connected with brush 74, the nextbutton is connected with thebrush 76 and the bottom button is connectedwith the brush 78 In the case of station 1358, the connections are thesame with the exception that the bottom button of the wipers 38individual to station 1358 is connected with the brush 79 Thus there areprovided means individual to the lines and which differ from each otherfor-causing the signalreceivers to give characteristic signals peculiarto the lines, thedi'lferentiation between the means, in the the artfurther description thereofwill not be necessary excepting to state thatthe wipers 39 of the calling line remain at rest 3 with one of thesewipers engaging the con. ftact 38 and the topmost contact of the as- Isociate bank of contacts, preparatory to the initiation of a late-r ornew call by this calling subscriber. \Vhen the jack of a calling. linereceives a plug, circuit-is established through the cutoff relay 6 in awell known manner, as a consequence of which the circuit of relay 25 ispened to open the cir-. cuit of the sluggish relay 83. The left/ handarmature switch of the released relay 83 es I tablishes a circuittraceable from its grounded contact, the armature switch engaging this-contact, the previously closed off normal switch-84, therestoringmagnet 85, to the grounded battery 10. The restoring magnet effects theregistration of the wipers 16 to 21 inclusive and the side switch wipers15, 23 and 24 to normal during the period that the magnet 85 isenergized, its armature switch maintainin the circuit for the relay 12which was 0 osed when the side switch wiper 15 was placed in its secondposition. The armature switch of the relays 12' of the four line seekingswitches belonging to each group of one hundred lines are seriallyrelated with'each other by way of-their alternate contacts and are alsoconnected with the alternate contacts of the line relay 11 of theparticular the fourth switch will seek a calling line.

In the restoring operation, the maintenance of the circuit for the relay12 at the armature switch of the restoring magnet 85 prevents the switchwhich is being restored from having its restoring function interruptedin the event of another call being initiated during the period ofrestoration.

The right hand armature switch of the deenergized relay 83 establishesacircuit for the restoring magnet 37 by way of the previously closed oil"normal switch 85 whereby the wipers 29 to 32 inclusive and the sideswitch wipers 28, 34 and 35 are restored to normal. To prevent thetransmitted numher from "being repeated in connection with the samecall, in the event of another call in the same group being initiatedprior to the release of the line hunting and signal selecting switches,I open the circuit including the wiper 32 and the selected magnet '57when the printing operation has been performed. To this end I place adriving magnet 86 in connection with the wiper 32 and in multiple 'ofthe selected printing magnet 57.

Eachtime the printing magnet is operated the driving magnet isoperatedto'turn the ratchet wheel 87 one-step. -When the ratchet wheel87 has been turned four steps the finger- 88 carried thereby opens theswitch '36 entirely to openthe circuit leading to the segment 38 of thecalling line. When the selector switches are restored circuit for therestoring magnet89 is closed at the right hand armature switch of relay83 whereby the ratchet wheel 87 will be restored to normal, it having arestoring spring ,for the purpose. When the wiper is restored to normalthe locking circuit of the relay 36 is opened and thereuponthe entireequipment is restored to normal.

While I have herein shown and particularly described the preferredembodiment of my invention I do not wish to be limited to the precisedetails ofco struction and circuit arrangement show: as changes mayreadily be made withou departing from the spirit of the invention, out

Having thus (lBSQX'lEQ-fid my invention I claim as new anddesire tosecure by Letters Patent the following 1. A signaling system including aplurality of signaling lines; signal receivers; selector, switches for;selecting signal re ceivers that are free for selection and assoandmeans common to the lines and.

nal receivers that are free for selection and asscciating the same withsignaling lines; means individual to the lines and which differ fromeach other for causing said signal receivers to give characteristicsignals peculiar to the lines; and means common to the lines andgoverned at the signaling ends thereof for eli'ecting the operation ofthe aforesaid means. a

3. A signaling system including a plurality of signaling lines; signalreceivers; selector switches for selecting signal receiv ers that arefree for selection and associat ing'the same with signaling lines; meansin dividual to the lines and which differ from each other for causingsaid signal receivers to give characteristic signals peculiar? to thelines; a plurality of circuits for effecting successive operations ofeach signal receiver;

means associated with the selected, signalreceiver by the operatedselector switch for establishing the signal receiver controlling,

circuits in succession through the selected signal receiver; and meanscommon toithe lines for eiiecting the operation of the iirst selectedsignal receiver; and means common to toe lines f r efiecting theoperation of the first afore: means.

In witness my name thi. vemher A. 1)., 1819..

MC'RTU QZ' L. JGHNSON.

Witnesses:

E. L. WHITE,

L. Canoe.

iereof, I hereunto subscribed, twentyseventh day. of \o:

